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Electronic theodolite 
Optical theodolite
Theodolite precautions before use
Theodolite plays an important role in many industries that affect the national economy and the people's livelihood. Regular verification of the theodolite is an important technical guarantee link. Although a series of measures have been adopted in recent years to improve the degree of automation of its data processing, manual readings have always been an important reason for restricting the accuracy of assays and improving the efficiency of assays. Therefore, it is very important to develop a rapid verification system for theodolites that can replace manual readings. necessary.
Theodolite is the main angle measuring instrument in the measurement work. It consists of a telescope, a horizontal dial, a vertical dial, a level, and a base. When measuring, place the theodolite on a tripod, use a vertical ball or optical point detector to align the center of the instrument on the ground station, level the instrument with a leveling instrument, aim the measurement target with a telescope, use a horizontal dial and a vertical dial Determine the horizontal and vertical angles.
The installation method of theodolite: The tripod is adjusted to equal length and is suitable for the height of the operator. The instrument is fixed on a tripod so that the instrument's base surface is parallel to the top surface of the tripod; the instrument is placed on the measuring station, and the approximate centering is estimated. Afterwards, step on a frame foot and adjust the optical eyepiece eyepiece (looking at the crosshair) and the objective lens (looking at the test site). Use your hands to swing the frame back and forth and left and right. The intersection point is coincident with the survey site, and the stability is fixed and the solid legs are stepped on; the telescopic tripod leg is long and flat; the leveling tube is paralleled and flattened spirally, and the leveling tube is leveled; the translational alignment part is rotated 90 degrees and the third spiral is used. Level the leveling tube; check the optical alignment, if there is a small amount of deviation, open the connecting screw translation base, make it accurately centered, tighten the connection spiral, and then check the centering of the leveling bubble.
The use of theodolite precautions: horizontal angle observation aiming at the target, aiming at the bottom as much as possible, in order to reduce the error caused by the target tilt; the same measurement back when observed, do not mistakenly re-test wrench or dial change handwheel, in order to avoid errors. If there is more than one cell deviation during the observation, the measurement should be re-leveled and remeasured; when calculating the half-measurement value, when the left target reading a is greater than the right target b, 360° should be added; the vertical angle observation At the same time, use the crosshairs for the same target to cut the same part. Prior to each reading, the vertical plate index bubble should be centered. When calculating the vertical angle and index difference, attention should be paid to the positive and negative signs; the tolerance requirements: the centering error is less than 3mm, the difference between the upper and lower half-measurement horizontal angle values ​​shall not exceed ±40′′; Within 25′′. Overrun should be retested.